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Articles 1 - 18 of 18
Full-Text Articles in Life Sciences
Plans For Studies Of Aspen Management On The San Juan National Forest, A Prospectus, W. M. Johnson, L. A. Mueller, C. A. Myers
Plans For Studies Of Aspen Management On The San Juan National Forest, A Prospectus, W. M. Johnson, L. A. Mueller, C. A. Myers
Aspen Bibliography
This prospectus for studies of aspen management on the San Juan National Forest is based on instructions contained in Director Price's' memorandum of October 24, 1968 and Assistant Director Hayes' memorandum of October 1, 1968.
Bird Hybrids In The Kettle Moraine, Millicent S. Ficken
Bird Hybrids In The Kettle Moraine, Millicent S. Ficken
Field Station Bulletins
Since hybridization in birds is so rare in nature, it is unusual to have the opportunity to study what happens when two species interbreed. Blue-winged Warblers (Vermivora pinus) and Golden-winged Warblers (V. chrysoptera) produce hybrids wherever they occur together. Furthermore, such hybrids are fertile and there is pairing between these hybrids and both parental species. When we learned that both species breed in the northern Kettle Moraine State Forest, we decided to see what sorts of interactions between the two species were occurring there. Our objective initially was to determine if pairing was random between the species, e.g. were Blue-wings …
Goldenrods, Peter J. Salamun
Goldenrods, Peter J. Salamun
Field Station Bulletins
The Goldenrods, with their abundance and diversity, produce one of the most brilliant natural wildflower displays in our area from mid-August to November. In North America there are about one hundred species of these plants occurring in such habitats as upland woods, marshes, bogs, abandoned fields, dry roadsides, prairies, railroad rights-of-way and even open cliffs and sandy beaches. Approximately twenty-one species are found in Wisconsin.
Benedict Prairie, Philip B. Whitford
Benedict Prairie, Philip B. Whitford
Field Station Bulletins
The Benedict Prairie Unit of The University of Wisconsin-Milwaukee Field Stations consists of about six acres, actually 100 feet wide and one half mile long, on what was once a railroad right of way on the old Kenosha-Silver Lake-Beloit branch line of the Chicago Northwestern Railroad.
In Quest Of The Elusive Ovenbird, Charles M. Weise
In Quest Of The Elusive Ovenbird, Charles M. Weise
Field Station Bulletins
The Ovenbird was selected for intensive study at the UWM Field Station for a variety of reasons. First, it is closely adapted in all respects-morphological, physiological, behavioral- to the upland forest environment, reaching maximum numbers in climax forests, such as the maple-beech forest which is under special investigation at the station. Second, because of its song it can be accurately censused and annual variations in numbers can be detected. Third, unlike most of the hard-wood forest birds, which spend most of their time in the tree canopy, the Ovenbird both nests and feeds on the ground, thus making it more …
The Biology Of Choristoneura Houstonana (Lepidoptera: Tortricidae), A Pest Of Juniperus Species, E. A. Heinrichs, Hugh E. Thompson
The Biology Of Choristoneura Houstonana (Lepidoptera: Tortricidae), A Pest Of Juniperus Species, E. A. Heinrichs, Hugh E. Thompson
Department of Entomology: Faculty Publications
Choristoneura houstonana (Grote) lays eggs singly in July. Egg development ranged from 8 to 11 days, with the majority hatching 10 days after oviposition. Larvae are solitary, and mine during early instars, but later instars feed externally on leaves in shelters made by webbing foliage together. There is one generation each year, and overwintering occurs in a hibernaculum, in mined leaves. Field-collected head-capsule width frequencies indicated nine larval instars. Rearing larvae on seedling junipers indoors indicated a range of 8–11 instars. Pupation occurs during June and July in the shelter where the larva feeds. The pupal stage lasted about 10 …
Seasonal Lipid Content Of Bagworm Larvae, E. A. Heinrichs
Seasonal Lipid Content Of Bagworm Larvae, E. A. Heinrichs
Department of Entomology: Faculty Publications
It is common knowledge to many who have attempted to control bagworms Thyridopteryx sp., that early instars are fairly easy to control, while later larval stages are less susceptible to insecticides. Studies of other insects (Bennett and Thomas 1963, Munson and Gottlieb 1953, Munson et al. 1954, Reier et al. 1953) have shown that as the lipid content increases, the susceptibility to insecticides (especially chlorinated hydrocarbons) decreases. To determine whether the lipid content of the bagworm larva increased with age a series of lipid extractions was conducted.
Winter Bird Studies At The Uwm Field Station, Charles M. Weise
Winter Bird Studies At The Uwm Field Station, Charles M. Weise
Field Station Bulletins
The winter trapping program was begun in the winter of 1965-66 and was expanded and conducted more systematically in 1966-67 and 1967-68. The primary objective has been to determine accurately the daily and seasonal changes in body weight and depot fat in the Chickadee and Junco. Secondarily, we (my students and I) have been interested in the winter population densities of these birds, their organization into social groups and flocks, their movements and range of activity in the local area.
The Role Of Adventitious Reinforcement In Operant Discrimination, Alan Kamil, John W. Davenport
The Role Of Adventitious Reinforcement In Operant Discrimination, Alan Kamil, John W. Davenport
Avian Cognition Papers
Rats were trained in 2 SD-SΔ discrimination experiments in which the effects of an SD-postponement contingency during SΔ and temporal regularity of SΔ duration were assessed. Experiment I showed that discrimination is markedly facilitated by the presence of an SD-postponement contingency of either fixed or variable duration. Experiment II showed that variable-duration SΔ periods in a noncontingent schedule can also greatly enhance formation of an operant discrimination. These effects were attributed to differences in the probability of adventitious reinforcement of SΔ behavior by SD events.
Parasites, Predators, And Other Arthropods Associated With Choristoneura Houstonana (Lepidoptera: Tortricidae) On Juniperus Species In Kansas, E. A. Heinrichs, Hugh E. Thompson
Parasites, Predators, And Other Arthropods Associated With Choristoneura Houstonana (Lepidoptera: Tortricidae) On Juniperus Species In Kansas, E. A. Heinrichs, Hugh E. Thompson
Department of Entomology: Faculty Publications
One parasitic dipterous species and 27 parasitic hymenopterous species were collected. Parasites were primarily collected by mass-rearing host larvae on cut host plant foliage in the laboratory or by rearing larvae on artificial diet. The tachinid Nemorilla pyste (Walk.) and five hymenopterous species, Glypta n. sp. (Ichneumonidae), Campoplex sp. (Ichneumonidae), Agathis acrobasidis (Cushman) (Braconidae), Elasmus atratus How. (Eulophidae), and Catolaccus aeneoviridis Girault (Pteromalidae), were definite parasites, and biological notes are given. Collection data are also given for the other 22 species.
One reduviid predator, Zelus socius Uhler, and six spiders were observed feeding on C. houstonana.
Wisconsin's Earliest Native Flowering Plant, Peter J. Salamun
Wisconsin's Earliest Native Flowering Plant, Peter J. Salamun
Field Station Bulletins
With the coming of spring there is an enthusiastic revival of interest in people for the out-of-doors and, not infrequently, a more than casual interest in the pursuit of the first flowering plant. For the stay-at-home there is contentment in simply waiting for the first Crocus, Scilla, Narcissus, Forsythia or even the Common Dandelion (Taraxacum officinale Weber) to bloom, but the dedicated naturalist is not satisfied until he finds the native harbinger-of-spring. During this adventure the often asked question is "What is the earliest native flowering species?"
Optimal Forest Investment Decisions Through Dynamic Programming, Gerard F. Schreuder
Optimal Forest Investment Decisions Through Dynamic Programming, Gerard F. Schreuder
Yale School of the Environment Bulletin Series
No abstract provided.
Lucille Vinyard Daily Reminder 1968, Lucille Vinyard
Lucille Vinyard Daily Reminder 1968, Lucille Vinyard
Lucille Vinyard Journal Collection
No abstract provided.
Soil Moisture Recharge In Stands Of Quaking Aspen And Gambel Oak In Central Utah, James L. Boynton
Soil Moisture Recharge In Stands Of Quaking Aspen And Gambel Oak In Central Utah, James L. Boynton
Aspen Bibliography
No abstract provided.
Evaluation Of The Effects Of Reduced Transpiration Upon Soil Moisture Retention In An Aspen Stand Throughout The Growing Season In Northern Utah, Michael Zan
Aspen Bibliography
No abstract provided.
Inoculation Of Living Aspen Trees With Basidiospores Of Fomes Igniarius Var. Populinus, P.D. Manion, D.W. French
Inoculation Of Living Aspen Trees With Basidiospores Of Fomes Igniarius Var. Populinus, P.D. Manion, D.W. French
Aspen Bibliography
No abstract provided.
Properties Of Soil Under Aspen And Herb Shrub Cover, R.K. Tew
Properties Of Soil Under Aspen And Herb Shrub Cover, R.K. Tew
Aspen Bibliography
No abstract provided.
Size Of Aspen Crop Trees Little Affected By Initial Sucker Density, R.W. Sorensen
Size Of Aspen Crop Trees Little Affected By Initial Sucker Density, R.W. Sorensen
Aspen Bibliography
No abstract provided.